RYAN, Circuit Judge.
This case presents the interesting dual questions 1) whether a federal court must apply federal or state claim preclusion law in deciding 2) whether a prior state court judgment upon subject matter over which only a federal court has jurisdiction is a bar to a subsequent federal court claim upon the identical cause of action. Plaintiff Miguel A. Gargallo sued defendants Merrill Lynch, Pierce, Fenner, & Smith, Inc. ("Merrill Lynch") and Larry...
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